The top rot of corn has serious occurrence, and the incidence of the disease is 30%, the rate of dead seedlings is 5%, and the rate of diseased plants is about 5%. Corn top rot is an important disease of corn. It was first discovered in 1998 in Fuxin, Liaoning Province, and it is a new disease of corn. In 2002, top rot was widespread and prevalent in Liaoning corn producing areas, causing serious yield losses. China Pesticide Network Xiaobian finishing relevant information for your reference:
Corn top rot can occur in the whole growth period of corn. Infestation at seedling stage showed slow growth of plants, chlorosis at the edge of the leaves, yellow streaks, leaf deformity, shrinkage or distortion, and the dead plants died or died; in the middle and late stages of growth, the base of the leaves rotted, only the main veins, the middle and upper parts Complete but multi-deformed, the new leaves of the later rot are rotted, resulting in short leaves, dead leaves or incomplete leaves, often with knife-like nicks and yellow streaks at the edge of the leaves; adult plants are susceptible to different degrees of dwarfing, The top leaves are short, the tissue is broken or the wrinkles are twisted, the base of the stem is short, and there are often worm-like cracks. The longitudinal section shows browning. The mildly susceptible plants can be stalked in the late stage, but the ears are small and many solid. The roots of susceptible plants are underdeveloped, the main roots are short, the root hairs are numerous and finely velvety, and the root crowns are rotted and browned. When the humidity in the field is high, there is a powdery white mold in the diseased part. The symptoms of corn top rot are complex and diverse. Some symptoms are similar to those of corn physiological diseases, insect pests and corn smut, which are easy to be confused. Therefore, special attention should be paid to diagnosis and prevention.
According to the pesticide network , the incidence of corn top rot in low-lying plots and soil-heavy blocks is heavier, especially in paddy fields where the paddy fields are changed to dry fields; the slopes and Gaogang plots are lightly affected, and the seed-borne bacteria will also cause the incidence of mountainous areas. The rate is increased. In early spring, the growth of maize seedlings weakened, which provided good conditions for pathogen invasion.
In addition to infesting corn, maize top rot bacteria also infect grasses such as sorghum, sudangrass, millet, wheat, rice, and pearl millet, as well as weeds such as foxtail and crabgrass. Corn top rot is a soil-inhabited bacterium, and the seeds can be spread over long distances. The pathogens have the ability to infect and re-infect the bacteria. Compared with other diseases of corn, the damage of corn top rot is more serious and potentially dangerous. Bigger.
Prevention and control of corn top rot:
Breeding resistant varieties. There is a difference in disease resistance between varieties. In production, planting resistant varieties can control the occurrence of top rot.
Pesticide control. In the early stage of the disease, there is a choice of chemical control. Commonly used agents are 50% carbendazim WP, 75% chlorothalonil WP, 80% mancozeb WP, and water spray.
Maize top rot is a newly discovered disease in China in recent years. There is no systematic research in China, and the corresponding data on the occurrence, development and epidemic of diseases are still rare. It is difficult to formulate accurate and effective disease prevention measures to guide prevention and treatment.
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